Lesson Plan: Factoring Perfect-Square Trinomials Mathematics • 9th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to factor a perfect square trinomial expression.


Students will be able to

  • recognize when a trinomial is a perfect square and find unknowns in perfect square trinomials,
  • factor perfect square trinomials,
  • factor trinomials that result in a perfect square trinomial after removing a common factor from each term,
  • evaluate algebraic expressions and evaluate numerical expressions using perfect square trinomials.


Students should already be familiar with

  • expanding perfect squares,
  • factoring trinomials,
  • square roots of perfect squares and rational numbers.


Students will not cover

  • factoring the difference of two squares,
  • factoring trinomials that are not perfect squares.

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